21231030233111 has 4 divisors (see below), whose sum is σ = 21682754280672. Its totient is φ = 20779306185552.

The previous prime is 21231030233059. The next prime is 21231030233117. The reversal of 21231030233111 is 11133203013212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21231030233111 - 2¹⁴ = 21231030216727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231030233117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225862023710 + ... + 225862023803.

It is an arithmetic number, because the mean of its divisors is an integer number (5420688570168).

Almost surely, 2^{21231030233111} is an apocalyptic number.

21231030233111 is a deficient number, since it is larger than the sum of its proper divisors (451724047561).

21231030233111 is an equidigital number, since it uses as much as digits as its factorization.

21231030233111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451724047560.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21231030233111 its reverse (11133203013212), we get a palindrome (32364233246323).

The spelling of 21231030233111 in words is "twenty-one trillion, two hundred thirty-one billion, thirty million, two hundred thirty-three thousand, one hundred eleven".